Answer:
that is a very good question sir
Step-by-step explanation:
Answer:

Step-by-step explanation:
Using the rule of exponents
=
, then
=
= 
Concave up is U-shaped.
There will be a inflection/critical point f'(x) =0 then a negative slope f'(x) = neg then another inflection/critical point f'(x) =0 at the bottom of the U-shape then a positive slope to last inflection/critical point. The interval for the Concave Up shape is the first and last inflection points.
So then there are about 15-20 doctors